First, what are you going to use your power washer for 100% of the time?
If for only your deck and swing set, 2000 - 2200 PSI's might be sufficent. If for many other jobs like power washing a home or barn or tractors, you might want a 3500 PSI.
regardless, get one with a good brand motor. These motors take quite a stress and run for long times. the more horse the better, but the more expensive.
I would want a rig with multiple spray heads. I use two heads quite often, the fan and the 22 bullit head.
You want a long hose and one to withstand the pressure for that rig.
you want one with good ball bearing wheels to move all over the place.
Your usage requirements and budget are the biggest factors.
My 3500 PSI, multiple head, 13 HP OHV Honda rig cost about $1200.
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